netdig 0.0.5

Utilities for analyzing and aggregating CIDR blocks
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

use ipnet::Ipv4Net;
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use std::{borrow::Borrow, fmt::Debug, net::Ipv4Addr};
#[cfg(feature = "tracing")]
use tracing::instrument;

// TODO: Could this be simplified with a macro?
const RFC6890: [Ipv4Net; 4] = [
    match Ipv4Net::new(Ipv4Addr::new(0, 0, 0, 0), 8) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(127, 0, 0, 0), 8) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(192, 0, 0, 0), 24) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(255, 255, 255, 255), 32) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
];
const RFC1918: [Ipv4Net; 3] = [
    match Ipv4Net::new(Ipv4Addr::new(10, 0, 0, 0), 8) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(172, 16, 0, 0), 12) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(192, 168, 0, 0), 16) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
];
const RFC6598: [Ipv4Net; 1] =
    [match Ipv4Net::new(Ipv4Addr::new(169, 254, 0, 0), 16) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    }];
const RFC3927: [Ipv4Net; 1] =
    [match Ipv4Net::new(Ipv4Addr::new(100, 64, 0, 0), 10) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    }];
const RFC7526: [Ipv4Net; 1] =
    [match Ipv4Net::new(Ipv4Addr::new(192, 88, 99, 0), 24) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    }];

const RFC2544: [Ipv4Net; 1] =
    [match Ipv4Net::new(Ipv4Addr::new(198, 18, 0, 0), 15) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    }];

const RFC5737: [Ipv4Net; 2] = [
    match Ipv4Net::new(Ipv4Addr::new(198, 51, 100, 0), 24) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(203, 0, 113, 0), 24) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
];

const RFC5771: [Ipv4Net; 2] = [
    match Ipv4Net::new(Ipv4Addr::new(224, 18, 0, 0), 4) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
    match Ipv4Net::new(Ipv4Addr::new(233, 252, 0, 0), 24) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    },
];

const RFC3232: [Ipv4Net; 1] =
    [match Ipv4Net::new(Ipv4Addr::new(240, 0, 0, 0), 4) {
        Ok(cidr) => cidr,
        Err(_) => panic!("invalid cidr"),
    }];

pub(crate) fn all() -> Vec<Box<dyn Warn>> {
    vec![Box::new(Private), Box::new(LargeMask)]
}

#[derive(Clone, Debug)]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub struct Warning(pub String);

impl From<String> for Warning {
    fn from(value: String) -> Self {
        Self(value)
    }
}

impl Borrow<str> for Warning {
    fn borrow(&self) -> &str {
        &self.0
    }
}

pub(crate) trait Warn: Debug {
    fn check(&self, cidr: Ipv4Net) -> Option<Warning>;
}

#[derive(Clone, Debug, Default)]
pub(crate) struct Private;

impl Warn for Private {
    #[cfg_attr(feature = "tracing", instrument(ret))]
    fn check(&self, cidr: Ipv4Net) -> Option<Warning> {
        for block in [
            &RFC1918[..],
            &RFC2544[..],
            &RFC3232[..],
            &RFC3927[..],
            &RFC5737[..],
            &RFC5771[..],
            &RFC6598[..],
            &RFC6890[..],
            &RFC7526[..],
        ]
        .concat()
        {
            if block.contains(&cidr) {
                return Some(format!("RESERVED ADDRESS SPACE: {cidr} is in the {block} private address space").into());
            }
        }

        None
    }
}

#[derive(Clone, Debug, Default)]
pub(crate) struct LargeMask;

impl Warn for LargeMask {
    #[cfg_attr(feature = "tracing", instrument(ret))]
    fn check(&self, cidr: Ipv4Net) -> Option<Warning> {
        if cidr.prefix_len() < 24 {
            return Some(
                format!(
                    "LARGE MASK: {cidr} contains {} hosts",
                    cidr.hosts().count()
                )
                .into(),
            );
        }

        None
    }
}